ros2_control_demo_example_2.xml

<library path="ros2_control_demo_example_2">
  <class name="ros2_control_demo_example_2/DiffBotSystemHardware"
         type="ros2_control_demo_example_2::DiffBotSystemHardware"
         base_class_type="hardware_interface::SystemInterface">
    <description>
      The ros2_control DiffBot example using a system hardware interface-type. It uses velocity command and position state interface. The example is the starting point to implement a hardware interface for differential-drive mobile robots.
    </description>
  </class>
</library>